Why do oil and water not mix?

Oil and water - is do not mix because
the molecules (tiny particles) of which they are composed are so different. The
molecules in oil are much bigger and contain many more atoms than those of
water. When
different liquids mix, it is because they have similar types of molecules which
readily link up with each other, like milk and water. In the case of oil and
water the groups of molecules prefer to stay apart.

The patches of oil floating on top of the water are usually circular because of another charac­teristic of molecules, which pro­duces what
scientists term surface tension. This is a cohesive force caused by the
attraction of the molecules to each other. They cling so tightly that they
produce a surface layer which acts like an elastic skin or the rubber envelope
of a balloon. The molecules are trying to pull the liquid into as small a space
as possible. As well as producing a circular shape, this tension makes the
surface area of each oil patch as small as possible.

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